NO924552L - Fremgangsmaate og anordning for koding av digitalt audiosignal - Google Patents

Fremgangsmaate og anordning for koding av digitalt audiosignal

Info

Publication number
NO924552L
NO924552L NO92924552A NO924552A NO924552L NO 924552 L NO924552 L NO 924552L NO 92924552 A NO92924552 A NO 92924552A NO 924552 A NO924552 A NO 924552A NO 924552 L NO924552 L NO 924552L
Authority
NO
Norway
Prior art keywords
bits
critical
bands
digital signals
transmitted
Prior art date
Application number
NO92924552A
Other languages
English (en)
Other versions
NO924552D0 (no
Inventor
Kenzo Akagiri
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP3091188A external-priority patent/JP3060577B2/ja
Priority claimed from JP3091187A external-priority patent/JP3060576B2/ja
Application filed by Sony Corp filed Critical Sony Corp
Publication of NO924552D0 publication Critical patent/NO924552D0/no
Publication of NO924552L publication Critical patent/NO924552L/no

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/665—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

I en effektiv anordning til koding av et digitalt signal der anordningen er Innrettet til å omforme (11) et signal på frekvensaksen for å dele signalet på frekvensaksen l signalkomponenter for hver blokk ved adaptlvt tildelte bltantall anvendes det en løsning med ortogonal omforming 11 av et digitalt inngangselgnal for å dele det ortogonalt onformede signal i signalkomponenter for hvert kritisk bånd for å kode signalkomponentene ved adaptlv tildeling av bitantall basert på et tillatt nivå for hvert kritiske bånd til utførelse av flytende behandling av dette der det ved utførelse av den nytende behandling av hver av en flerhet av små blokker son hver har en båndbredde som er smalere enn båndbredden for det kritiske bånd anvendes en løsning for informasjon om ordlengde S3 for en liten blokk blant de små blokker l de respektive kritiske bånd hvorved antall biter for ordlengde reduseres slik at det blir mulig å utføre bitkomprlmerlng l en høyere grad. Ifår det gjelder utførelse av den flytende behandling Sl av hver av en flerhet av små blokker son hver har en båndbredde mindre enn i båndbredden for det kritiske bånd anvendes det en løsning med overføring, istedet for av flytende koeffisienter Sl for de respektive kritiske bånd av informasjon om et tillatt støynivå S2 for hvert kritiske bånd og ordleng- dene S3 for de små blokker hvorved antall biter som skal overføres blir redusert slik at det blir mulig å utføre bltkomprlmerlng i høyere grad. Ved utførelse av den nytende behandling av hver liten blokk hvis båndbredde er smalere enn for det kritiske bånd anvendes det l tillegg en løsning med overføring av informasjon om ordlengde S3 svarende til tildelte bltantall og med overføring, Istedet for av flytende koeffisienter, informasjon som angis på en kvantlserlngs- tabell S6 knyttet til tillatte støynivåer som hver har sitt bestenmelsesområde forskjøvet l en retning mot ¿ lavere nivåer med et på forhånd bestemt nivå fra et slgnalnlvåonråde l det kritiske bånd hvorved bitkomprlmerlng kan utføres i høyere grad.
NO92924552A 1991-03-29 1992-11-25 Fremgangsmaate og anordning for koding av digitalt audiosignal NO924552L (no)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3091188A JP3060577B2 (ja) 1991-03-29 1991-03-29 ディジタル信号符号化方法
JP3091187A JP3060576B2 (ja) 1991-03-29 1991-03-29 ディジタル信号符号化方法
PCT/JP1992/000237 WO1992017942A1 (fr) 1991-03-29 1992-02-28 Procede de codage de signaux numeriques

Publications (2)

Publication Number Publication Date
NO924552D0 NO924552D0 (no) 1992-11-25
NO924552L true NO924552L (no) 1993-01-22

Family

ID=26432649

Family Applications (1)

Application Number Title Priority Date Filing Date
NO92924552A NO924552L (no) 1991-03-29 1992-11-25 Fremgangsmaate og anordning for koding av digitalt audiosignal

Country Status (17)

Country Link
US (1) US5311561A (no)
EP (1) EP0531538B1 (no)
KR (1) KR100312664B1 (no)
CN (1) CN1032102C (no)
AT (1) ATE165198T1 (no)
AU (1) AU654533B2 (no)
BR (1) BR9204799A (no)
CA (1) CA2083709A1 (no)
CS (1) CS92692A3 (no)
DE (1) DE69225100T2 (no)
DK (1) DK0531538T3 (no)
FI (1) FI109627B (no)
HU (1) HU213592B (no)
NO (1) NO924552L (no)
PL (1) PL168474B1 (no)
RU (1) RU2090973C1 (no)
WO (1) WO1992017942A1 (no)

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Also Published As

Publication number Publication date
HUT63278A (en) 1993-07-28
EP0531538B1 (en) 1998-04-15
CN1032102C (zh) 1996-06-19
WO1992017942A1 (fr) 1992-10-15
DE69225100D1 (de) 1998-05-20
HU9203759D0 (en) 1993-04-28
KR100312664B1 (ko) 2002-12-26
ATE165198T1 (de) 1998-05-15
HU213592B (en) 1997-08-28
AU654533B2 (en) 1994-11-10
FI925400A (fi) 1992-11-27
DE69225100T2 (de) 1998-08-06
AU1338392A (en) 1992-11-02
DK0531538T3 (da) 1998-10-19
EP0531538A4 (en) 1994-09-21
EP0531538A1 (en) 1993-03-17
PL294003A2 (en) 1992-11-30
FI925400A0 (fi) 1992-11-27
CA2083709A1 (en) 1992-09-30
RU2090973C1 (ru) 1997-09-20
PL168474B1 (pl) 1996-02-29
CS92692A3 (en) 1992-10-14
FI109627B (fi) 2002-09-13
NO924552D0 (no) 1992-11-25
BR9204799A (pt) 1993-07-13
US5311561A (en) 1994-05-10
CN1065565A (zh) 1992-10-21

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